What is the total number of particles present in a $bcc$ unit cell?

The number of atoms contained in one face-centred cubic $(FCC)$ unit cell of a monoatomic substance is:

The unit cell of a $NaCl$ lattice:

Calculate the total volume occupied by all atoms in a simple cubic unit cell if the radius of the atom is $3 \times 10^{-8} \ cm$.

In an ionic crystal,$\frac{r^{+}}{r^{-}} = 0.524$,the coordination number of the cation is:

In a compound $AB$,$A$ atoms occupy the corners of the cube and the $B$ atoms occupy the body centre of the cube. If the $A$ atoms possess magnetic moment due to up-spin and $B$ atoms possess magnetic moment due to down-spin,the magnetic nature of the compound $AB$ in an isolated unit cell is